• Lower Thigh - measure the full circumference of your thigh, at the point where the top of the warmer will fall

• Lower Calf - measure the full circumference of your calf

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Rated 5 out of
5 by
Brett from
Great sock for summer hiking or around townThis is the best sock I have ever used for summer wear. It is great for hiking because the wool, on me, prevents blisters from forming. On 100+ degree days there is an ultralight version available.,,,,Very comfortable. I line dry mine in an attempt to get extra life out of them.

Date published: 2015-03-21

Rated 5 out of
5 by
John from
great sock with just the right amount of cushion and supportWonderful pair of socks with just the right amount of cushion and support. Perfect for wear in hot weather where mid or heavy weight socks are a bit too warm to wear. Looks good when wearing trail running shoes as well as fits on mid cut hiking boots.,,

Date published: 2015-05-02

Rated 5 out of
5 by
TimS from
My Favorite Socks!I've been buying SmartWool PhD socks for years now. They last forever and are great for moisture and blister management. These are the only socks I run in anymore.

Date published: 2016-03-31

Rated 4 out of
5 by
John from
Best sock In a long timeNo more sock slippage in your running shoe (the worst--especially in a race). Thick enough for great cushioning--but not sweat even on the warmest days.